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A New Method for Adhesion Strength Assessment of Indented Polymer Coatings

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Abstract

The paper proposes a new method for adhesion strength assessment of polymer coatings which is based on Rockwell indentation with experimental data processing via finite element simulation in terms of fracture mechanics (cohesive zone model, CZM). With the example of a titanium-alkoxide epoxy composition deposited on low-carbon steel, it is shown that when the Rockwell indenter penetrates perpendicular to the coating surface, circular buckling delamination around its indent occurs due to adhesive bond rupture by radial shear with extrusion of the coating material from beneath the indenter. The parameter controlled in the simulation is the width of coating delamination zones formed in indentation experiments at a constant indentation depth. The conditions of adhesive contact are specified using the CZM bilinear law, which describes the relation between the tangential adhesive stress and the adhesive bond elongation under shear in the contact plane of interacting surfaces. The criterion of quantitative adhesion strength assessment is the ultimate specific surface energy of adhesive failure. The simulation gives an optimum value of the ultimate specific surface energy of adhesive failure of the coating at CZM parameters that provide the best convergence of the numerical and experimental data.

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Notes

  1. The equipment was provided by the Plastometria Collective Center of IES UrB RAS.

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ACKNOWLEDGMENTS

The authors are thankful to A.S. Igumnov, Head of the System Support Department of the Supercomputer Center of IMM UrB RAS, for assisting the numerical computations and to V.A. Osipova from the Laboratory of Organic Materials, IOS UrB RAS, for preparing the coated specimens.

Funding

The work was performed under research project No. AAAA-A18-118020790145-0.

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Authors and Affiliations

  1. Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, 620049, Ekaterinburg, Russia

    S. V. Smirnov, M. V. Myasnikova, D. A. Konovalov & E. O. Smirnova

  2. I.Ya. Postovsky Institute of Organic Synthesis of the Ural Branch of the Russian Academy of Sciences, 620108, Ekaterinburg, Russia

    A. V. Pestov

Authors
  1. S. V. Smirnov
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  2. M. V. Myasnikova
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  3. A. V. Pestov
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  4. D. A. Konovalov
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  5. E. O. Smirnova
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Correspondence to M. V. Myasnikova.

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Smirnov, S.V., Myasnikova, M.V., Pestov, A.V. et al. A New Method for Adhesion Strength Assessment of Indented Polymer Coatings. Phys Mesomech 26, 514–522 (2023). https://doi.org/10.1134/S1029959923050041

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  • DOI: https://doi.org/10.1134/S1029959923050041

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